ASTM F708-92(2018)e1

Standard Practice for Design and Installation of Rigid Pipe Hangers

ABSTRACT
This practice covers acceptable methods of fabricating and installing rigid pipe hangers used to support shipboard piping systems, it provides guidance for the design of hanger caps, straps and standoffs, selection of hanger and hanger liner materials, hanger bolting, and hanger spacing. The pipe hanger style includes: split cap hanger, 3strap hanger, welded hanger, U-bolt hanger, J band type hanger, Nelson hanger, clamp hanger assembled with mounting channel, poly-block twin clamp hanger, crimp-on weld stud-type hangers, banded weld stud-type hanger, and poly-block single-clamp hanger. Guidance in determining pipe hanger spacing are provided. Special consideration should be given to areas of concentrated loads, such as risers, valves, or groups of fittings, and to piping configurations that could create rotational forces. Hangers need not be lined unless the hanger and pipe are of dissimilar material. All hanger bolts within tanks or other inaccessible areas shall be secured with lock nuts, lock washers, or by some other means. Pipe hangers and standoffs located in areas subject to corrosion, such as in bilges, ballast tanks, and areas exposed to the weather, should be zinc-plated or blasted and coated with inorganic zinc or coated with the same material as that of the surrounding area. Standoffs fabricated from pipe should not be used within tanks. Consideration should be given to thermal growth of the piping when selecting or locating hangers so as not to overstress the piping or hangers.
SCOPE
1.1 This practice covers acceptable methods of fabricating and installing rigid pipe hangers used to support shipboard piping systems with temperatures of 650°F (343°C) or less.  
1.2 This practice provides guidance for the design of hanger caps, straps and standoffs, selection of hanger and hanger liner materials, hanger bolting, and hanger spacing.  
1.3 Other hanger designs may be used provided they result in an adequately supported vibration-free piping system and are compatible with the intended system service and temperature limitations.  
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 31-Aug-2018
• ICS: 21.060.70 - Clamps and staples
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation: F708 − 92 (Reapproved 2018) An American National Standard
Standard Practice for
Design and Installation of Rigid Pipe Hangers
ThisstandardisissuedunderthefixeddesignationF708;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
ε NOTE—The Keywords section was added editorially in September 2018.
1. Scope A307 Specification for Carbon Steel Bolts, Studs, and
Threaded Rod 60 000 PSI Tensile Strength
1.1 This practice covers acceptable methods of fabricating
and installing rigid pipe hangers used to support shipboard
3. Terminology
piping systems with temperatures of 650°F (343°C) or less.
3.1 Definitions:
1.2 This practice provides guidance for the design of hanger
caps, straps and standoffs, selection of hanger and hanger liner
3.1.1 liner, n—the material used to isolate a pipe from its
materials, hanger bolting, and hanger spacing.
hanger.
1.3 Other hanger designs may be used provided they result
3.1.2 rider bar, n—a protective strip of material installed
in an adequately supported vibration-free piping system and
between the pipe and the hanger where frequent linear move-
are compatible with the intended system service and tempera-
ment of the pipe is expected.
ture limitations.
3.1.3 rigid pipe hanger, n—a device that transfers the load
1.4 The values stated in inch-pound units are to be regarded
imposed by the piping, insulation, and system medium to the
as standard. The values given in parentheses are mathematical
supporting structure.
conversions to SI units that are provided for information only
3.1.4 standoff, n—therigidmemberthatconnectsthehanger
and are not considered standard.
strap, saddle, or band to the supporting structure. A standoff is
1.5 This standard does not purport to address all of the
usually made up of one or more pieces of flat bar, pipe, angle
safety concerns, if any, associated with its use. It is the
bar, or flanged plate to suit a specific location.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. List of Pipe Hanger Styles
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor-
4.1 This practice incorporates 26 pipe hanger assemblies as
dance with internationally recognized principles on standard-
shown on Figs. 1-12(c) as follows:
ization established in the Decision on Principles for the
Hanger Fig. No.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Split cap hanger (single leg standoff) 1(a)
Split cap hanger (dual leg standoff) 1(b)
Barriers to Trade (TBT) Committee.
Split cap hanger (chair type) 1(c)
Strap hanger 2(a)
2. Referenced Documents
Strap hanger (assembled for clearance with rider bar) 2(b)
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
2.1 ASTM Standards:
strip)
Welded hanger (flat bar U-type) 3(a)
1 Welded hanger (round bar U-type) 3(b)
This practice is under the jurisdiction of ASTM Committee F25 on Ships and
Welded hanger (square bar U-type) 3(b)
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
U-bolt hanger 4(a)
Machinery and Piping Systems.
U-bolt hanger (assembled for clearance with rider bar) 4(b)
Current edition approved Sept. 1, 2018. Published October 2018. Originally
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
approved in 1981. Last previous edition approved in 2014 as F708 – 92 (2014).
strip)
DOI: 10.1520/F0708-92R18E01.
Welded hanger (single leg standoff welded direct to pipe) 5(a)
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Welded hanger (dual leg standoff welded direct to pipe) 5(b)
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
“J” band type hanger (insulated pipe) 6(a)
Standards volume information, refer to the standard’s Document Summary page on
“J” band type hanger (bare pipe) 6(b)
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F708 − 92 (2018)
6.5 Table 7 is a listing of hanger liner materials generally
Nelson hanger 7
Clamp hanger assembled with mounting channel 8
used to isolate the pipe from the hanger (see 9.1.1).
4,5
Poly-block twin clamp hanger (assembled with welding plate) 9(a)
4,5
Poly-block twin clamp hanger (assembled with welding stud) 9(b)
7. Application and Limitations
Poly-block twin clamp hanger (assembled with mounting 9(c)
4,5
channel)
7.1 Unless otherwise noted, application and limitations on
Crimp-on weld stud-type hangers 10
Banded weld stud-type hanger 11
the use of various style hangers should be as noted with each
Poly-block single-clamp hanger (assembled with welding plate) 12(a)
hanger detail.
Poly-block single-clamp hanger (assembled with welding stud) 12(b)
Poly-block single-clamp hanger (assembled with mounting 12(c)
channel)
8. Hanger Spacing
8.1 Table 8 provides general guidance in determining pipe
5. Hanger Designs
hanger spacing. Special consideration should be given to areas
5.1 Figs. 1-5 and Fig. 6(a) hangers are designs generally
of concentrated loads, such as risers, valves, or groups of
manufactured by shipyards or their subcontractors. See also
fittings, and to piping configurations that could create rota-
Tables 1-6.
tional forces.
5.2 Fig. 6, Fig. 8, Fig. 10, and Fig. 11 hangers are commer-
cially available from various vendors. Fig. 8, Fig. 10, and Fig.
9. General Requirements
11 hangers are primarily designed for use in supporting
9.1 The following general requirements and conditions are
electrical cables, but are suitable for hanging small size pipe
applicable to all styles of hangers:
and tubing.
3 9.1.1 Hangers need not be lined unless the hanger and pipe
5.2.1 The Fig. 7 hanger is a specific design that has been
are of dissimilar material, or when the system internal operat-
patented by Nelson Division of TRW.
4,5 ing temperature is 300°F (149°C) and over, or 50°F (10°C) and
5.2.2 The Fig. 9 and Fig. 12 hangers are primarily
under and the heat transmitted to the other side of the structure
designed for use when supporting multiple runs of pipe or
to which the hanger is attached may be objectionable. For
tubing.
hanger liner materials, see 6.5.
9.1.2 All hanger bolts within tanks or other inaccessible
6. Materials and Manufacture
areas shall be secured with lock nuts, lock washers, or by some
6.1 Hanger materials for straps, saddles, and U-bolts for
other means.
Figs. 1-5 hangers and standoffs should be fabricated from
9.1.3 Pipe hangers and standoffs located in areas subject to
commercial quality carbon steel. The steel should be a weld-
corrosion, such as in bilges, ballast tanks, and areas exposed to
able grade with a minimum tensile strength of 47 ksi (324
the weather, should be zinc-plated or blasted and coated with
MPa) and capable of being bent at room temperature through
inorganic zinc or coated with the same material as that of the
90° to an inside radius equal to the material thickness without
surrounding area.
cracking on the outside of the bend.
9.1.4 Standoffs fabricated from pipe should not be used
6.2 Hangers in Fig. 1, Fig. 6, Fig. 7, Fig. 10, and Fig. 11 are
within tanks.
generally manufactured from carbon steel. Fig. 8 is furnished
9.1.5 Wherethermalgrowthofpipingexceeds0.100in.(2.5
in carbon steel and stainless steel. Fig. 9 and Fig. 12 hanger
mm) or long runs of pipe are affected by ship flexing, such as
clamp halves are injected molded plastic furnished with carbon
long runs on the weather deck, or long runs in longitudinal
steel or stainless steel hardware.
passageways, a metal rider bar attached to the pipe or a
TFE-fluorocarbon wear strip should be used in conjunction
6.3 Bands and buckles for Fig. 6 and Fig. 11 hangers should
with a clearance type hanger, or other means should be
be carbon steel electroplated zinc or stainless steel.
provided to prevent chaffing of the pipe.
6.4 Hanger bolts and nuts should be regular series hex type
9.1.6 Consideration should be given to thermal growth of
electroplated zinc with unified national coarse threads Class 2
the piping when selecting or locating hangers so as not to
fit in accordance with Specification A307, Grade B.
overstress the piping or hangers.
9.1.7 Nonmetallic pipe should be hung in accordance with
The sole source of supply of the apparatus known to the committee at this time
the manufacturer’s recommendations.
is TRW Nelson Div., Toledo Ave. and E. 28th St., Lorain, OH 44055. If you are
aware of alternative suppliers, please provide this information to ASTM Interna-
10. Workmanship, Finish, and Appearance
tional Headquarters. Your comments will receive careful consideration at a meeting
of the responsible technical committee, which you may attend.
10.1 Finished hanger components shall have a workman-
The sole source of supply of the apparatus known to the committee at this time
likeappearanceandbefreeofcracksorotherinjuriousdefects.
is Stauff Corp., 41 Newman St., Hackensack, NJ 07601. If you are aware of
alternative suppliers, please provide this information to ASTM International
Surface scale, rust, welding slag, or any foreign material (such
Headquarters.Your comments will receive careful consideration at a meeting of the
as oil) shall be removed before painting or coating.
responsible technical committee, which you may attend.
The sole source of supply of the poly-block hangers known to the committee at
this time is Behringer Corp., 108 Jabez St., Newark, NJ 07105. If you are aware of 11. Keywords
alternative suppliers, please provide this information to ASTM International
11.1 design; fabrication; installation; piping systems; rigid
Headquarters.Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend. pipe hangers
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F708 − 92 (2018)
NOTE 1—For dimensions of hangers, see Table 1.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.
NOTE 3—For Fig. 1(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.
NOTE 4—Maximum length of standoff “L” shall be as follows: flat bar = 18 in.; pipe = 30 in.; and angle bar = 42 in.
FIG. 1 Split Cap Hangers
NOTE 1—For dimensions of hangers, see Table 2.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.
1 1
NOTE 3—Install standard flat washers as necessary to unlined strap to provide ⁄32 to ⁄8-in. (0.8 to 3.2-mm) clearance for linear motion of piping when
required.
FIG. 2 Strap Hangers
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F708 − 92 (2018)
NOTE 1—For dimensions of hangers, see Table 3.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and are intended to be used unlined only.
NOTE 3—Weld as indicated for size 3-in. NPS and above. For 2 ⁄2-in. NPS and below, weld hanger on outside only.
FIG. 3 Welded Hangers
NOTE 1—For dimensions of hangers, see Table 4.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and are intended to be used unlined.
FIG. 4 U-Bolt Hangers
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F708 − 92 (2018)
NOTE 1—For dimensions of hangers, see Table 5.
NOTE 2—These hangers are limited to use on normally dry ferrous piping systems, such as sounding tubes. Air escapes and plumbing drains with a
wall thickness of 0.200 in. (5.1 mm) or more.
NOTE 3—These hangers should not be used where takedown is required or in the steering gear room, inner bottoms, fore peak, aft peak or deep tanks,
or other high vibration or inaccessible areas.
NOTE 4—For Fig. 5(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.
FIG. 5 Welded Hangers
NOTE 1—For dimensions of hangers, see Table 6.
NOTE 2—These hangers are suitable for use in all locations, except tanks and areas exposed to the weather, and can be used lined or unlined.
FIG. 6 J-Band Type Hangers
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F708 − 92 (2018)
NOTE 1—This hanger is suitable for use in all locations except tanks.
NOTE 2—This hanger is limited to use on pipe 4-in. NPS and below with a system operating temperature of 200°F (93.3°C) or less.
FIG. 7 Nelson Hanger
NOTE 1—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to high
corrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.
NOTE 2—These hangers are suitable for supporting single or multiple runs of piping 2 in. (50.8 mm) or smaller.
FIG. 8 Clamp Hanger Assembled with Mounting Channel
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F708 − 92 (2018)
NOTE 1—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to high
corrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.
1 1
NOTE 2—These hangers are limited to use on pipe 1 ⁄4-in. NPS and below and tubing 1 ⁄2-in. outside diameter and below with a system operating
temperature of 300°F (149°C) or less.
NOTE 3—These hangers may be used for multiple pipe installations installed vertically, horizontally, or stacked using a welding plate, welding stud,
or attached to a mounting channel.
4,5
FIG. 9 Stauff Twin Clamp Hanger
NOTE 1—These hangers are suitable for use in all locations, except tanks, and should be coated with neoprene or other similar material when used to
support nonferrous tubing.
NOTE 2—These hangers are limited to use on tubing with an outside diameter of 1 ⁄8 in. (28.6 mm) or smaller with a system operating temperature
of 180°F (82.2°C) or less.
NOTE 3—Size and quantity of tubes may be varied provided they are arranged so as to be securely clamped.
FIG. 10 Crimp-On Weld Stud Hangers
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F708 − 92 (2018)
NOTE 1—These hangers are suitable for use in all locations except tanks.
NOTE 2—These hangers are limite
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: F708 − 92 (Reapproved 2014) F708 − 92 (Reapproved 2018)An American National Standard
Standard Practice for
Design and Installation of Rigid Pipe Hangers
This standard is issued under the fixed designation F708; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
ε NOTE—The Keywords section was added editorially in September 2018.
1. Scope
1.1 This practice covers acceptable methods of fabricating and installing rigid pipe hangers used to support shipboard piping
systems with temperatures of 650°F (343°C) or less.
1.2 This practice provides guidance for the design of hanger caps, straps and standoffs, selection of hanger and hanger liner
materials, hanger bolting, and hanger spacing.
1.3 Other hanger designs may be used provided they result in an adequately supported vibration-free piping system and are
compatible with the intended system service and temperature limitations.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information
only. mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A307 Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength
3. Terminology
3.1 Definitions:
3.1.1 liner—liner, n—the material used to isolate a pipe from its hanger.
3.1.2 rider bar—bar, n—a protective strip of material installed between the pipe and the hanger where frequent linear movement
of the pipe is expected.
3.1.3 rigid pipe hanger—hanger, n—a device that transfers the load imposed by the piping, insulation, and system medium to
the supporting structure.
3.1.4 standoff—standoff, n—the rigid member that connects the hanger strap, saddle, or band to the supporting structure. A
standoff is usually made up of one or more pieces of flat bar, pipe, angle bar, or flanged plate to suit a specific location.
4. List of Pipe Hanger Styles
4.1 This practice incorporates 26 pipe hanger assemblies as shown on Figs. 1-12(c) as follows:
Hanger Fig. No.
This practice is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.11 on Machinery
and Piping Systems.
Current edition approved Aug. 1, 2014Sept. 1, 2018. Published September 2014October 2018. Originally approved in 1981. Last previous edition approved in 20082014
as F708 – 92 (2008).(2014). DOI: 10.1520/F0708-92R14.10.1520/F0708-92R18E01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
F708 − 92 (2018)
Split cap hanger (single leg standoff) 1(a)
Split cap hanger (dual leg standoff) 1(b)
Split cap hanger (chair type) 1(c)
Strap hanger 2(a)
Strap hanger (assembled for clearance with rider bar) 2(b)
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
strip)
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
strip)
Welded hanger (flat bar U-type) 3(a)
Welded hanger (round bar U-type) 3(b)
Welded hanger (square bar U-type) 3(b)
U-bolt hanger 4(a)
U-bolt hanger (assembled for clearance with rider bar) 4(b)
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
strip)
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
strip)
Welded hanger (single leg standoff welded direct to pipe) 5(a)
Welded hanger (dual leg standoff welded direct to pipe) 5(b)
“J” band type hanger (insulated pipe) 6(a)
“J” band type hanger (bare pipe) 6(b)
3,
Nelson hanger 7
Nelson hanger 7
Clamp hanger assembled with mounting channel 8
4,5,
Poly-block twin clamp hanger (assembled with welding plate) 9(a)
4,5
Poly-block twin clamp hanger (assembled with welding plate) 9(a)
4,5,
Poly-block twin clamp hanger (assembled with welding stud) 9(b)
4,5
Poly-block twin clamp hanger (assembled with welding stud) 9(b)
4,5,
Poly-block twin clamp hanger (assembled with mounting channel) 9(c)
4,5
Poly-block twin clamp hanger (assembled with mounting channel) 9(c)
Crimp-on weld stud-type hangers 10
Banded weld stud-type hanger 11
5,
Poly-block single-clamp hanger (assembled with welding plate) 12(a)
Poly-block single-clamp hanger (assembled with welding plate) 12(a)
5,
Poly-block single-clamp hanger (assembled with welding stud) 12(b)
Poly-block single-clamp hanger (assembled with welding stud) 12(b)
5,
Poly-block single-clamp hanger (assembled with mounting channel) 12(c)
Poly-block single-clamp hanger (assembled with mounting channel) 12(c)
5. Hanger Designs
5.1 Figs. 1-5 and Fig. 6(a) hangers are designs generally manufactured by shipyards or their subcontractors. See also Tables 1-6.
5.2 Fig. 6, Fig. 8, Fig. 10, and Fig. 11 hangers are commercially available from various vendors. Fig. 8, Fig. 10, and Fig. 11
hangers are primarily designed for use in supporting electrical cables, but are suitable for hanging small size pipe and tubing.
3,
5.2.1 The Fig. 7 hanger is a specific design that has been patented by Nelson Division of TRW.
4,5,
5.2.2 The Fig. 9 and Fig. 12 hangers are primarily designed for use when supporting multiple runs of pipe or tubing.
6. Materials and Manufacture
6.1 Hanger materials for straps, saddles, and U-bolts for Figs. 1-5 hangers and standoffs should be fabricated from commercial
quality carbon steel. The steel should be a weldable grade with a minimum tensile strength of 47 ksi (324 MPa) and capable of
being bent at room temperature through 90° to an inside radius equal to the material thickness without cracking on the outside of
the bend.
6.2 Hangers in Fig. 1, Fig. 6, Fig. 7, Fig. 10, and Fig. 11 are generally manufactured from carbon steel. Fig. 8 is furnished in
carbon steel and stainless steel. Fig. 9 and Fig. 12 hanger clamp halves are injected molded plastic furnished with carbon steel or
stainless steel hardware.
6.3 Bands and buckles for Fig. 6 and Fig. 11 hangers should be carbon steel electroplated zinc or stainless steel.
The sole source of supply of the apparatus known to the committee at this time is TRW Nelson Div., Toledo Ave. and E. 28th St., Lorain, OH 44055. If you are aware
of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible
technical committee, which you may attend.
The sole source of supply of the apparatus known to the committee at this time is Stauff Corp., 41 Newman St., Hackensack, NJ 07601. If you are aware of alternative
suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical
committee committee, , which you may attend.
The sole source of supply of the apparatus known to the committee at this time is Stauff Corp., 41 Newman St., Hackensack, NJ 07601.
The sole source of supply of the poly-block hangers known to the committee at this time is Behringer Corp., 108 Jabez St., Newark, NJ 07105. If you are aware of
alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible
technical committee, which you may attend.
´1
F708 − 92 (2018)
6.4 Hanger bolts and nuts should be regular series hex type electroplated zinc with unified national coarse threads Class 2 fit
in accordance with Specification A307, Grade B.
6.5 Table 7 is a listing of hanger liner materials generally used to isolate the pipe from the hanger (see 9.1.1).
7. Application and Limitations
7.1 Unless otherwise noted, application and limitations on the use of various style hangers should be as noted with each hanger
detail.
8. Hanger Spacing
8.1 Table 8 provides general guidance in determining pipe hanger spacing. Special consideration should be given to areas of
concentrated loads, such as risers, valves, or groups of fittings, and to piping configurations that could create rotational forces.
9. General Requirements
9.1 The following general requirements and conditions are applicable to all styles of hangers:
9.1.1 Hangers need not be lined unless the hanger and pipe are of dissimilar material, or when the system internal operating
temperature is 300°F (149°C) and over, or 50°F (10°C) and under and the heat transmitted to the other side of the structure to which
the hanger is attached may be objectionable. For hanger liner materials, see 6.5.
9.1.2 All hanger bolts within tanks or other inaccessible areas shall be secured with lock nuts, lock washers, or by some other
means.
9.1.3 Pipe hangers and standoffs located in areas subject to corrosion, such as in bilges, ballast tanks, and areas exposed to the
weather, should be zinc-plated or blasted and coated with inorganic zinc or coated with the same material as that of the surrounding
area.
9.1.4 Standoffs fabricated from pipe should not be used within tanks.
9.1.5 Where thermal growth of piping exceeds 0.100 in. (2.5 mm) or long runs of pipe are affected by ship flexing, such as long
runs on the weather deck, or long runs in longitudinal passageways, a metal rider bar attached to the pipe or a TFE-fluorocarbon
wear strip should be used in conjunction with a clearance type hanger, or other means should be provided to prevent chaffing of
the pipe.
9.1.6 Consideration should be given to thermal growth of the piping when selecting or locating hangers so as not to overstress
the piping or hangers.
9.1.7 Nonmetallic pipe should be hung in accordance with the manufacturer’smanufacturer’s recommendations.
10. Workmanship, Finish, and Appearance
10.1 Finished hanger components shall have a workman-like appearance and be free of cracks or other injurious defects. Surface
scale, rust, welding slag, or any foreign material (such as oil) shall be removed before painting or coating.
11. Keywords
11.1 design; fabrication; installation; piping systems; rigid pipe hangers
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F708 − 92 (2018)
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F708 − 92 (2018)
NOTE 1—For dimensions of hangers, see Table 1.
´1
F708 − 92 (2018)
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.
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F708 − 92 (2018)
NOTE 3—For Fig. 1(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.
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F708 − 92 (2018)
NOTE 4—Maximum length of standoff “L” shall be as follows: flat bar = 18 in.; pipe = 30 in.; and angle bar = 42 in.
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FIG. 1 Split Cap Hangers
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NOTE 1—For dimensions of hangers, see Table 2.
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NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.
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1 1
NOTE 3—Install standard flat washers as necessary to unlined strap to provide ⁄32 to ⁄8-in. (0.8 to 3.2-mm) clearance for linear motion of piping when
required.
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FIG. 2 Strap Hangers
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NOTE 1—For dimensions of hangers, see Table 3.
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NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and are intended to be used unlined only.
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NOTE 3—Weld as indicated for size 3-in. NPS and above. For 2 ⁄2-in. NPS and below, weld hanger on outside only.
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FIG. 3 Welded Hangers
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NOTE 1—For dimensions of hangers, see Table 4.
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NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and are intended to be used unlined.
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FIG. 4 U-Bolt Hangers
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NOTE 1—For dimensions of hangers, see Table 5.
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NOTE 2—These hangers are limited to use on normally dry ferrous piping systems, such as sounding tubes. Air escapes and plumbing drains with a
wall thickness of 0.200 in. (5.1 mm) or more.
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NOTE 3—Th
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